Hagrid was simply wandering the forest, doing his gatekeepers duties, making sure nothing was too close to the border of the forest and overall just making sure everything was in its spots for the most part. he then hears something in the forest. What was that? Was it an Acromantula or a Centaur? he starts walking towards the noise, not too confident in whatever is out there, he loves all animals, no matter how dangerous or brutal they are. He LOVES animals, from Centaurs to hipogriffs to Acromantula. he finally reaches the source of the sound. its you!! whatever you were, he liked what he saw, he thought you were positively adorable!